WO1981003480A1 - Dispositif derouleur pour bandes de feuilles, notamment feuilles de plastique - Google Patents

Dispositif derouleur pour bandes de feuilles, notamment feuilles de plastique Download PDF

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Publication number
WO1981003480A1
WO1981003480A1 PCT/EP1981/000062 EP8100062W WO8103480A1 WO 1981003480 A1 WO1981003480 A1 WO 1981003480A1 EP 8100062 W EP8100062 W EP 8100062W WO 8103480 A1 WO8103480 A1 WO 8103480A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
air cushion
unwinding device
deflection guide
driven
Prior art date
Application number
PCT/EP1981/000062
Other languages
German (de)
English (en)
Inventor
A Hutzenlaub
Original Assignee
Kampf Maschf Erwin
Kampf Berta & Co Verwaltung
A Hutzenlaub
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kampf Maschf Erwin, Kampf Berta & Co Verwaltung, A Hutzenlaub filed Critical Kampf Maschf Erwin
Publication of WO1981003480A1 publication Critical patent/WO1981003480A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/044—Sensing web tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • B65H23/1888—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/31—Features of transport path
    • B65H2301/311—Features of transport path for transport path in plane of handled material, e.g. geometry
    • B65H2301/3112—S-shaped

Definitions

  • the invention relates to an unwinding device for webs, in particular plastic films, with an unwinding shaft driven by a motor generator, with a deflection guide, the interior of which is under pressure, feeds an air cushion, and with a driven deflection roller.
  • Plastic films are wound up in a more or less warm state on a production line following a stretching section or the like.
  • signs of aging, shrinkage, crystallization and the like occur which shorten the length of the film. So that the wound plastic film does not suffer from these processes, which have an overall effect as shrinkage, a very soft winding must take place so that shrinking of the plastic film is possible.
  • Out of roundness and other deformations form when storing such soft wraps. The winding becomes out of round and sags in a so-called sagging belly.
  • the object of the invention is such a design of an unwinding device that pulsations are completely avoided even when unwinding sensitive plastic films from a soft winding.
  • the wrap angle of the web at the deflection guide is greater than 140 °; b) the air pressure in the interior of the deflection guide is at least three times greater than the pressure in the air cushion; c) a pressure measuring device is provided for measuring the pressure in the air cushion, the output signal of which for regulating the
  • a large loop around the deflection guide has proven to be effective.
  • the pressure inside the deflection guide must be at least three times greater than the pressure in the air cushion. Thereby he is sufficient to supply the air cushion safely, also in the event of pulsations.
  • the pressure in the air cushion itself which is proportional to the belt tension, is used as a control variable for the motor generator.
  • the air cushion pressure signal is converted directly into an electrical proportional signal in a converter and fed to the controller.
  • a comparative circuit is applied, the output line of which carries the controlled variable for the motor generator. This regulation ensures that processing takes place at a constant speed.
  • the air forming the air cushion flows out into the environment at the dumbbell lines and at the end circular ring segments. This creates the risk that the film is excited to flutter.
  • an outflow wall in the form of a perforated plate is arranged on the inlet side and / or the outlet side of the deflection guide approximately parallel to the film web. Ambient air is sucked in by the outflowing air through the holes in this perforated plate, so that the flow is calmed down and turbulence is suppressed.
  • the length of the common tangent of the deflection guide and the next driven roller is less than 150 mm. It has proven to be expedient to bring the next following driven roller as close as possible to the air cushion deflection guide in order to allow the plastic film to be taken over by this driven roller in the shortest possible way.
  • the unwinding device comprises a carrying device 1 for a Unwinding shaft 2 with a winding 3 of a plastic film to be unwound.
  • the unwinding shaft 2 is driven by a motor generator 4.
  • the plastic film 5 runs directly from the winding 3 to a deflection guide 6 which has a cylinder wall 7 in the form of a perforated plate which extends at least over an angle of 140 °.
  • An excess pressure is generated in the interior 17 of the deflection guide 6 by a blower 8 so that air flows out through the holes in the perforated plate. This air creates an air cushion 20 between the deflection guide 6 and the plastic film 5.
  • the arrangement is such that the pressure in the interior 17 is 2.5 to 4 times greater than the pressure of the air cushion.
  • This pressure in the interior 17 must be at least three times greater than the pressure in the air cushion, so that a uniform feeding of the air cushion is possible, which is sufficient to absorb pulsations.
  • the plastic film 5 is taken over by a driven deflection roller 9.
  • An outflow wall 10 in the form of a perforated plate is arranged approximately parallel to the path of the film web.
  • the air from the air cushion mainly flows in the circumferential direction.
  • the proportion of air flowing out in the axial direction is comparatively small and does not impair the air cushion.
  • the outflow wall 10 is used for air intake in the area of the outflowing air. This prevents the formation of turbulence in the outflow area, so that a uniform air flow is achieved.
  • the driven deflection roller 9 is expediently placed as close as possible to the deflection guide 6, so that the common tangent of the deflection guide and the next drive roller has a length of less than 150 am.
  • the invention enables the unwinding speed to be regulated and thus a uniform unwinding.
  • a pressure measuring tube 11 is arranged in the region of an outflow opening of the perforated plate 7, so that the pressure in the air cushion 20 can be measured through this pressure measuring tube.
  • This pressure is converted in a converter 12 into a current value which, after amplification in an amplifier 13, is input into a comparator circuit 14.
  • the other input of the comparator circuit is connected to the output line of a setpoint generator 15.
  • the comparator circuit 14 outputs a control voltage on its output line, which is amplified in an amplifier 16.
  • the boosted control voltage is supplied to the motor generator 4 and regulates the speed of this motor generator 4 and thus the speed of the unwinding shaft 2 so that the pressure inside the air cushion 20 maintains a constant value which is predetermined by the setpoint generator 15.
  • a constant pressure inside the air cushion means a constant value for the tape tension of the development.
  • the speed of the settlement can be regulated in a simple manner within the scope of the invention.

Landscapes

  • Advancing Webs (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Abstract

Un dispositif derouleur pour bandes de feuilles, notamment feuilles de plastique (5), comprend un arbre (2) mu par un moteur (4), un renvoi (6) avec une chambre interieure en surpression alimentant un coussin d'air et un cylindre de renvoi entraine (9). Le probleme technique consiste a supprimer les pulsations du deroulage des fragiles feuilles de plastique. L'angle d'enroulement autour du renvoi (6) est superieur a 140 . La pression de l'air dans la chambre interieure (17) de renvoi est au moins trois fois plus grande que la pression dans le coussin d'air (20). Pour mesurer la pression dans le coussin d'air (20) il est prevu un dispositif de mesure de pression (11), dont le signal de sortie sera utilise pour regler le moteur (4).
PCT/EP1981/000062 1980-06-07 1981-06-04 Dispositif derouleur pour bandes de feuilles, notamment feuilles de plastique WO1981003480A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3021532A DE3021532C1 (de) 1980-06-07 1980-06-07 Abwickelvorrichtung fuer Warenbahnen,insbesondere Kunststoffolien
DE3021532 1980-06-07

Publications (1)

Publication Number Publication Date
WO1981003480A1 true WO1981003480A1 (fr) 1981-12-10

Family

ID=6104131

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1981/000062 WO1981003480A1 (fr) 1980-06-07 1981-06-04 Dispositif derouleur pour bandes de feuilles, notamment feuilles de plastique

Country Status (5)

Country Link
US (1) US4461432A (fr)
JP (1) JPH0157017B2 (fr)
DE (1) DE3021532C1 (fr)
GB (1) GB2090439B (fr)
WO (1) WO1981003480A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6061453A (ja) * 1983-09-15 1985-04-09 エドウイン．ジエイ．モンタルボ．ジユニア 回転運動制御装置
US4842177A (en) * 1983-12-02 1989-06-27 International Business Machines Corporation Air bearing tape support for guiding tape and sensing tape tension
US5709352A (en) * 1996-07-29 1998-01-20 R. J. Reynolds Tobacco Company Zero tension web unwinder apparatus and method
DE10024120B4 (de) * 2000-05-18 2005-08-25 Maschinenfabrik Wifag Rollenwechsler mit Motorbremse
US20040042789A1 (en) * 2002-08-30 2004-03-04 Celanese Ventures Gmbh Method and apparatus for transferring thin films from a source position to a target position
US8413920B2 (en) * 2003-06-13 2013-04-09 The Procter & Gamble Company Method and apparatus for unwinding a roll of web material
JP5430019B2 (ja) * 2011-11-15 2014-02-26 日特エンジニアリング株式会社 フィルムの間欠搬送装置及びフィルムの間欠搬送方法
US20130153618A1 (en) * 2011-12-15 2013-06-20 Randy E. Armbruster Method for transporting print media

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB946342A (en) * 1961-06-07 1964-01-08 British Cellophane Ltd Improvements in or relating to web tension measuring devices
US3312415A (en) * 1964-03-09 1967-04-04 Printing Means for controlling the tension of a web
US3567093A (en) * 1969-06-03 1971-03-02 Michigan Oven Co Fluid cushion turning roll for moving web

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA818735A (en) * 1969-07-22 Canadian General Electric Company Limited Control system for web handling apparatus
US2754883A (en) * 1952-12-22 1956-07-17 Firestone Tire & Rubber Co Apparatus for tension-calendering fabric
US2945637A (en) * 1957-07-19 1960-07-19 Westinghouse Electric Corp Paper mill winder drives
US3057574A (en) * 1960-08-08 1962-10-09 Beloit Iron Works Web tension control means
US3156399A (en) * 1961-10-23 1964-11-10 Sperry Rand Corp Fluid bearing
US3455192A (en) * 1966-02-21 1969-07-15 Beloit Eastern Corp Paper web unwinder shoe brake
DE2033738A1 (en) * 1970-07-08 1972-01-27 Dornbusch & Co Plastics films guide roll - low inertia and low-friction with air bearing
US4182472A (en) * 1978-07-13 1980-01-08 W. R. Grace & Co. Contactless turning guide for running webs
US4342413A (en) * 1981-02-05 1982-08-03 Crown Zellerbach Corporation Turning bar for moving web

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB946342A (en) * 1961-06-07 1964-01-08 British Cellophane Ltd Improvements in or relating to web tension measuring devices
US3312415A (en) * 1964-03-09 1967-04-04 Printing Means for controlling the tension of a web
US3567093A (en) * 1969-06-03 1971-03-02 Michigan Oven Co Fluid cushion turning roll for moving web

Also Published As

Publication number Publication date
US4461432A (en) 1984-07-24
JPS57500781A (fr) 1982-05-06
GB2090439B (en) 1984-08-22
JPH0157017B2 (fr) 1989-12-04
GB2090439A (en) 1982-07-07
DE3021532C1 (de) 1981-11-19

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